package primary

fun main() {
    //布尔值存true和false
    val a = 1 < 2
    val x = 10
    val y = 20
    val b = x in 20..50
    println(a)
    println(b)
    val c = true
    val d = false
    println(c && d)
    println(c || d)
    println(!c)
}